2 layers25.7 × 67.6 mm
2 layers43.8 × 31.1 mm
A Single Ended Operational Amplifier mainly made with bipolar technology and a NMOS differential pair, two amplification stages and a Class AB output stage. Entirely designed with discrete components, soldered onto a self-made, 2 layers PCB.
- Size
- 43.8 × 31.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 23
- Nets
- 17
- Pads
- 78
- Tracks, vias
- 268, 24
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 24 Feb 2024
- Updated
- 24 Feb 2024
Overview
OpAmp is an open-source printed circuit board by AleDedor, from the AleDedor/Discrete_OpAmp repository on GitHub. It is a 2-layer board of 43.8 × 31.1 mm with 23 parts on 17 nets, routed with 268 tracks and 24 vias.
It is built around the BC847BS, BC857BS and FDG6335N. Its parts include 9 transistors, 2 resistors, 1 capacitor and 1 connector.
Main components
3
BC847BS
SOT-363Bipolar (BJT)hongjiachengBC857BS
SOT-363-55℃~+150℃ 15nA 2 PNP 200MHz 200mA 220 300mV 300mW 45V 5V PNP SOT-363 Bipolar (BJT) ROHSYangzhou Yangjie Electronic TechnologyBipolar (BJT)FDG6335N
SOT-363100mW 120pF 130mΩ@4.5V 15pF 2 N-Channel 20V 20pF 700mA 750mV SOT-363 MOSFETs ROHSTECH PUBLICMOSFETs
README
README.mdDiscrete_OpAmp
A Single Ended Operational Amplifier mainly made with bipolar technology and a NMOS differential pair, two amplification stages and a Class AB output stage. Entirely designed with discrete components, soldered onto a self-made, 2 layers PCB.
Final results, in lab tests:
- +-5V dual power supply, 10 mA current absorption, buffer configuration.
- GBWP > 3Mhz.
- HD2 = 40dB (second harmonic distortion).
- Slew Rate = 1.5V/us.
- Offset = 50mV.
Soldered PCB image:
Parts
23| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | BC847BS | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q1, Q4, Q7, Q8 |
| 4 | BC857BS | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q2, Q5, Q6, Q9 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 1 | 1n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | Conn_02x04_Counter_Clockwise | Package_DIP:DIP-8_W7.62mm_Socket | J1 |
| 1 | FDG6335N | Package_TO_SOT_SMD:SOT-363_SC-70-6 | Q3 |
| 1 | VBE1 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP1 |
| 1 | VBE2 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP2 |
| 1 | VBE3 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP6 |
| 1 | VBE4 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP7 |
| 1 | VBE5 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP8 |
| 1 | VBE6 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP9 |
| 1 | VO1 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP4 |
| 1 | VO2 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP5 |
| 1 | VOUT | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP10 |
| 1 | VS1 | TestPoint:TestPoint_THTPad_D1.5mm_Drill0.7mm | TP3 |
Questions
How big is the OpAmp PCB?
It measures 43.8 × 31.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the OpAmp use?
23 parts, built around the BC847BS, BC857BS and FDG6335N. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the OpAmp KiCad files?
From the AleDedor/Discrete_OpAmp repository on GitHub, at the commit this page was made from: the board is PCB/OpAmp/OpAmp.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpAmp design in my own project?
Its repository states no licence, so its author keeps all rights: ask AleDedor before reusing the design.
Similar boards
- 4 layers58 × 38 mm
Qspimux2-prog
felixheld/qspimux
QSPI flash multiplexer - connect a SPI NOR flash to either an embedded system or a programmer for remote firmware tests
99 parts57CC-BY-SA-4.0 - 2 layers210.4 × 166.1 mm
- 6 layers60 × 55 mm
PoE Ethernet GPIB Adapter
Kofen/PoE_Ethernet_GPIB_Adapter
This folder contains the necessary hardware files for the PoE Ethernet GPIB Adapter project.
198 parts120GPL-3.0 - 2 layers129.2 × 50 mm
- 4 layers120 × 100 mm
- 2 layers40 × 18 mm
- 4 layers29.9 × 32 mm
Models heart rev1.1
KushlaVR/models-heart
Можливості: Керування через WIFI з телефона або ПК 5 незалежних каналів (світлодіоди/сервомотори) 1 Н-міст для підключення мотора (піковий струм до 3А) Вмонтована BMS 1S та контроллер заряду Li-Ion акумулятора з…
106 parts7GPL-3.0